Paging over a high-speed downlink shared channel

ABSTRACT

An apparatus and methods are provided for paging in a HSDPA connected mode CELL_PCH or URA_PCH state. Preferably, a WTRU is configured to select various PICH information that is broadcast by a base station. The WTRU is preferably configured to receive paging messages, based on the selected PICH information. In one embodiment, a preferred WTRU is configured to receive paging messages, based on a PICH, a HS-SCCH, and a HS-PDSCH. In another embodiment, a preferred WTRU is configured to receive paging messages, based on a PICH and a HS-PDSCH. In both embodiments, a time delay parameter is preferably used so that the WTRU may listen for either the HS-SCCH or HS-PDSCH for a period of time and return to a sleep mode if no paging message is received.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of U.S. patent application Ser. No.14/172,318 filed Feb. 4, 2014, which is a Continuation of U.S. patentapplication Ser. No. 12/026,093 filed Feb. 5, 2008, now U.S. Pat. No.8,744,496, which claims the benefit of U.S. Provisional Application Nos.60/888,209 filed Feb. 5, 2007, 60/894,611 filed Mar. 13, 2007, and60/895,248 filed Mar. 16, 2007, the contents of each of which beingincorporated by reference as if fully set forth.

TECHNICAL FIELD

The subject matter disclosed herein relates to wireless communicationsmethods and apparatus.

BACKGROUND

High-Speed Downlink Packet Access (HSDPA) was introduced in Release 5 ofthe Third Generation Partnership Project (3GPP) standards for widebandcode division multiple access (WCDMA) wireless communication networks. Akey operating principle of HSDPA is to share a fast downlink (DL) pipe.An example of a fast DL pipe is a high-speed downlink physical sharedchannel (HS-DPSCH). A universal mobile telecommunication system (UMTS)Terrestrial Radio Access Network (UTRAN) may configure up to 15HS-DPSCHs. Each HS-DPSCH may be shared by all wireless transmit/receiveunits (WTRUs) operating within the network on a per transmission timeinterval (TTI) basis, for example, every 2 millisecond. As a result,information on the downlink channels may be sent to a different WTRU inevery 2 millisecond interval.

In order to allow WTRUs to determine ownership of the information onHS-DPSCH shared channels, a base station also sends one or more parallelhigh-speed shared control channels (HS-SCCHs). Among other things, theHS-SCCHs provide detailed data to enable receiving WTRUs to determinewhich information transmitted on the HS-DPSCH is addressed to aparticular WTRU and to enable the particular WTRU to recover thetransmitted information.

In HSDPA, a base station utilizes three key concepts to achievehigh-speed data transmission. The three key concepts are: adaptivemodulation and coding (AMC), retransmissions using a hybrid-automaticrepeat request (HARQ), and base station scheduling.

A base station may take advantage of the changing channel conditions asperceived by a WTRU in communication with the base station. In order toaccomplish this, the base station can schedule transmissions to maximizeDL throughput, for example, using 16 quadrature amplitude modulation(QAM) for a WTRU close to the base station and using quadrature phaseshift keying (QPSK) for a WTRU at cell edge. Such fast scheduling iscomplemented with the use of HARQs, allowing retransmission of transportblocks that are received at a WTRU with errors. The HARQs areimplemented at a physical layer and multiple simultaneous HARQ processesare permitted in order to maximize utilization.

An ongoing problem in HSDPA compliant networks is latency within theUTRAN, especially in setup delays for packet switched (PS) and circuitswitched (CS) calls. Reducing the delay during WTRU state transitions isone way to improve network performance.

As illustrated in FIG. 1, a WTRU compliant with current standards can bein one of 4 possible states when in a connected mode, CELL_DCH,CELL_FACH, URA_PCH, or CELL_PCH. The WTRU state is based on WTRU trafficvolume and mobility. The WTRU may communicate with the UTRAN only whenin Cell_FACH or Cell_DCH states. Cell_PCH and URA_PCH states areintended for power saving operation. URA_PCH is used by a highly mobileWTRU that changes cells frequently. In both of these power savingstates, the WTRU has no uplink mechanism to send traffic to the UTRAN.However, the WTRU can be paged to notify it to change states to either aCell_FACH state or Cell_DCH state.

The paging procedure is a two step process. To save battery power, aWTRU is configured with a discontinuous reception (DRX) cycle that shutsoff the WTRU's receiver chain periodically. This is known as sleep mode.A WTRU is only awake (the receiver chain is on) for certain frames knownas paging occasions. Within each paging occasion, a WTRU listens for aPaging Indicator on a Paging Indicator Channel (PICH). The PagingIndicator instructs a WTRU to monitor the paging channel (PCH) carriedin the Secondary Common Control Physical Channel (S-CCPCH). The PCH is atransport channel that is mapped to a logical Paging Control Channel(PCCH).

Multiple S-CCPCHs may be used. The WTRU selects from among the multipleS-CCPCHs based on an Initial WTRU Identity. The selected S-CCPCH isassociated with a single PICH. This is the PICH that the WTRU monitorsfor paging indications. There is a strict delay requirement between thePICH and the associated paging message on the S-CCPCH. This delay offsetis defined to allow the WTRU to receive the PICH and then the pagingmessage. 3GPP Release 6 specifies this offset as 7,680 chips, or 2millisecond. After recovering the PCCH, the WTRU can either enter theCell_FACH state and perform a CELL UPDATE or return to sleep mode untilthe next paging occasion.

One technique for reducing this state transition time is to map the PCCHto a high-speed downlink shared channel (HS-DSCH) instead of the PCH. Afaster downlink rate results in a shorter transmission time for thepaging message and faster state transitions. This protocol stackarchitecture is shown in FIG. 2. The inventors have recognized severalproblems that exist when mapping the PCCH to the HS-DSCH.

First, HSDPA is currently only allowed in the Cell_PCH state and iscontrolled by the WTRU variable HS-DSCH_RECEPTION.

Second, the HS-DSCH must be configured to operate in the downlink. Thisinvolves assigning a WTRU an address HS-DSCH Radio Network TemporaryIdentifier (H-RNTI), configuring a HS-SCCH channelization code, andconfiguring HARQ information, such as the number of HARQ processes andmemory partition. Currently, there is no mechanism defined to allow sucha configuration in Cell_PCH and URA_PCH states.

Third, a WTRU in Cell_PCH or URA_PCH state is unable to send channelquality indication (CQI) information to the UTRAN because no uplinkcommunication is possible. Thus, the base station cannot take fulladvantage of the AMC techniques required by HSDPA.

Fourth, once a WTRU receives a Paging Indicator on the PICH, the WTRUexpects a paging message in the associated S-CCPCH. This S-CCPCH occurs7,680 chips after the PICH. In HSDPA, a base station schedules WTRUtraffic. While it is possible to maintain a strict timing relationshipbetween the PICH and the HS-DSCH, maintaining this relationshiprestricts the base station scheduling flexibility for transmission overHS-DSCH. Limiting the base station scheduling flexibility for HS-DSCH isundesirable since other types of traffic (for example, dedicated trafficchannel (DTCH) and dedicated control channel (DCCH) are also carriedover HS-DSCH.

Therefore, HSDPA paging of a WTRU in CELL_PCH and URA_PCH states withoutthe above mentioned disadvantages is desired.

SUMMARY

An apparatus and methods are provided for paging in a HSDPA connectedmode CELL_PCH or URA_PCH state. Preferably, a WTRU is configured toselect various PICH information that is broadcast by a base station. TheWTRU is preferably configured to receive paging messages, based on theselected PICH information. In one embodiment, a preferred WTRU isconfigured to receive paging messages, based on a PICH, a HS-SCCH, and aHS-PDSCH. In another embodiment, a preferred WTRU is configured toreceive paging messages, based on a PICH and a HS-PDSCH. In bothembodiments, a time delay parameter is preferably used so that the WTRUmay listen for either the HS-SCCH or HS-PDSCH for a period of time andreturn to a sleep mode if no paging message is received.

BRIEF DESCRIPTION OF THE DRAWINGS

A more detailed understanding may be had from the following description,given by way of example in conjunction with the accompanying drawings.

FIG. 1 is a block drawing of conventional WTRU states for a radioresource control (RRC) connected mode.

FIG. 2 are comparative stack diagrams providing a comparison of aconventional Paging Channel (PCH) protocol stack architecture formapping a logical Paging Control Channel (PCCH) with the mapping of aPCCH to a HS-DSCH for HSDPA paging and a mapping of a DCCH/DTCH to aHS-DSCH for HSPDA paging.

FIG. 3 is a flow diagram of a method for selecting PICH information fromreceived system information broadcasts.

FIG. 4 is a procedural diagram illustrating several HSDPA pagingprocedures in accordance with the teachings of the present invention.

FIG. 5 is a timing diagram showing a timing relationship between a PICHframe and associated high-speed shared control channel (HS-SCCH)subframes.

FIG. 6 is a timing diagram showing a timing relationship between a PICHframe and associated HS-PDSCH subframes.

FIG. 7 is an illustration of an HSDPA network configured for paging inaccordance with the teachings of the present invention.

DETAILED DESCRIPTION

When referred to herein, the terminology “wireless transmit/receive unit(WTRU)” includes but is not limited to a user equipment (UE), a mobilestation, a fixed or mobile subscriber unit, a pager, a cellulartelephone, a personal digital assistant (PDA), a computer, or any othertype of user device capable of operating in a wireless environment. Whenreferred to herein, the terminology “base station” includes but is notlimited to a Node-B, a site controller, an access point (AP), or anyother type of interfacing device capable of operating in a wirelessenvironment.

Apparatus and methods for paging in Cell_PCH and URA_PCH states in ahigh speed downlink packet access (HSDPA) wireless communication systemare disclosed. Three preferred WTRU configurations and methods aredisclosed, one in which utilization of a Paging Indicator Channel (PICH)is optional. A first preferred configuration and method utilizes a PICHand paging groups. A second preferred configuration and method utilizespaging groups, but instead of using a PICH, a high-speed shared controlchannel (HS-SCCH) signaling procedure allows each paging group to beassociated with its own group high-speed downlink shared channel(HS-DSCH) radio network transaction identifier (H-RNTI). The PICH mayoptionally be retained for support of legacy WTRUs. A third preferredconfiguration and method utilizes a PICH and a high-speed downlinkphysical shared channel (HS-DPSCH).

In all three preferred configurations and methods, in order to map aPaging Control Channel (PCCH) to the HS-DSCH, high-speed channelconfiguration information must be provided to the WTRU. Thisconfiguration information may be received in a base station broadcast aspart of the system information by adding a new information element to anexisting system information block (SIB) and/or defining a new SIB andassociated schedule.

The broadcasted configuration information may include: PCCH over HSDPAcapability; a common HS-DSCH radio network transaction identifier(H-RNTI) to be used for paging messages; common high-speed downlinkphysical shared channel (HS-PDSCH) information including a HS-SCCHscrambling code and channelization code; common HARQ informationincluding a number of HARQ processes, memory partitioning relatedparameters, and the like.

An exemplary broadcasted configuration information message is shownbelow in Table 1. The Need column indicates if the information element(IE) is a mandatory or optional parameter. MD indicates the IE is“mandatory” and must be broadcast and then received by UEs to be able touse the feature. The Multi column indicates for a parent parameter howmany instances of the child parameter are allowed. For example, therecan be 1 to <maxSCCPCH> of the PICH for HSDPA supported paging list.

TABLE 1 Information Type and Element/Group Name Need Multi ReferenceSemantics Description DL Scrambling Code MD Secondary DL Scrambling codeto be scrambling applied for HS-DSCH and code HS-SCCH. Default is samescrambling code as for the primary CPICH. PICH for HSDPA MP 1 tosupported paging list <maxSCCPCH> >HSDPA associated MP PICH info PICHinfo >HS-PDSCH MP Integer HS-PDSCH channel, Channelisation Code (0 . . .15) associated with the PICH for HS-SCCH less PAGING TYPE 1 messagetransmission. Number of PCCH MP Integer (1 . . . 5) number of subframesused to transmissions transmit the PAGING TYPE 1. Transport Block SizeList MP 1 . . . 2 >Transport Block Size MP Integer Index of valuerange 1to 32 of Index (1 . . . 32) the MAC-ehs transport block size

The HSDPA associated PICH information element shown in Table 1 may alsobe broadcast and received along with an information element DL-HSPDSCHsystem information that is used for a WTRU operating in CELL_FACH state,or these elements may be broadcast to WTRUs only operating in CELL_PCHor URA_PCH states.

Referring to FIG. 3, a method 300 for selecting PICH information forHSPDA based paging is illustrated for an appropriately configured WTRU.The method 300 begins with receiving an “HSDPA Associated PICH Info”information element (IE), (step 310). This IE is transmitted from a basestation, and may be broadcast. After receiving the IE, a WTRU compiles alist of candidate PICH for HSDPA information and determines a value kthat corresponds to the number of candidates, (step 320). The WTRU thencalculates a PICH candidate selection index, Index_(PICH) according toequation (1):

Index_(PICH)=U_RNTI mod k;   Equation (1)

where U-RNTI is the UTRAN radio network temporary identifier, (step330). The WTRU finally selects the PICH information from the compiledlist based on the calculated Index_(PICH), (step 340).

Referring to FIG. 4, a signal flow diagram 400 of preferred HSDPA pagingprocedures disclosed herein includes a Serving Radio Network Controller(SRNC) 405, a Controlling Radio Network Controller (CRNC) 410, a BaseStation 415, and a WTRU 420. The signal flow diagram 400 generally showsthe radio resource control (RRC) layer of all entities depicted, withthe exception of the WTRU 420, which shows both a WTRU physical layer,WTRU-L1, 425 and a WTRU RRC 430 layer. It should be understood howeverthat various layers may perform the described functions. The examplesignal flow diagram 400 is based on a WTRU in discontinuous reception(DRX) mode.

The base station 415 uses the DRX information of the WTRU 420 forscheduling paging messages destined for the WTRU 420. In this manner,the base station 415 will schedule paging messages destined for the WTRU420 when the WTRU 420 is not in a sleep mode, thereby reducing theamount of time the WTRU 420 must monitor the HS-SCCH. When the WTRU 420enters a CELL_PCH or a URA_PCH state, the WTRU 420 receives systeminformation to configure the HSDPA paging channel, (step 435). The WTRU420 may then determine its common paging H-RNTI as well as the HS-SCCHand/or HS-PDSCH and HARQ setup details. Alternatively, a WTRU-specificH-RNTI may be used for paging. There can be any number of HS-SCCHsassociated with the paging channel and the WTRU 420 can select fromamong these using procedures known to those skilled in the art, such asthose based on the initial WTRU identity.

With specific reference now to Case 1 within FIG. 4, when the UTRANneeds to page the WTRU 420, a signal is received at the SRNC 405. TheSRNC 405 forwards the message to the CRNC 410 via the lur interface, ifnecessary, (step 440). The CRNC 410 forwards a message that is destinedto the WTRU (for example, a Paging Type 1 message) to the base station415 via the lub interface, (step 445). A scheduler function resident inthe base station 415, which has information relating to the DRX timingof the WTRU-L1 425, guarantees that the message is sent only during theWTRU awake time. This can be implemented in a variety of ways that willbe apparent to those skilled in the art. Purely for example, the basestation 415 may maintain a paging transmit queue common to all WTRUbeing served by the base station 415. Immediately prior to the WTRU-L1425 entering an awake state of its DRX mode, the scheduling function ofthe base station 415 queries the paging transmit queue to determinewhether a message is destined for WTRU-L1 415. If the determination ispositive, the base station 415 transmits a paging indicator on the PICH,(step 450).

After a time interval T_(PICH), which is between a minimum time delayT_(PICH) _(_) _(HSSCCH) _(_) _(MIN) and a maximum time delay T_(PICH)_(_) _(HSSCCH) _(_) _(MAX), the base station 415 transmits thecorresponding message using a common or WTRU-specific paging H-RNTIaddress on the HS-SCCH, (step 455), and the message is mapped to theHS-PDSCH, (step 460). The parameter T_(PICH) _(_)HSSCCH_MIN may be hardcoded and predetermined. The parameter T_(PICH) _(_) _(HSSCCH) _(_)_(MAX) may be broadcast from the base station 415 as part of the systeminformation or other system transmission or broadcast. The time delayparameter T_(PICH) may be defined mathematically as follows:

T_(PICH) _(_) _(HSSCCH) _(_) _(MIN)≦T_(PICH)≦T_(PICH) _(_) _(HSSCCH)_(_) _(MAX).   Equation (2)

An alternative method for timing the transmission of the PICH andsubsequent transmission channels may be used. When the message isforwarded by the CRNC 410 to the base station 415, the base station 415again stores the message in a WTRU specific transmission queue. Ascheduling function of the base station 415 schedules the message fortransmission to WTRU 420 during an awake time based on DRX informationof the WTRU 420. The message is scheduled during a future transmissiontime interval (TTI). In other words, the message is scheduled fortransmission based on a current TTI (TTI_(Current)), plus a time delta,Δ. The base station 415 calculates Δ based on the WTRU-L1 425 DRX cycle.During the time interval Δ, the base station 415 may perform furtherscheduling algorithms to determine whether any MAC-hs packet data units(PDUs) require transmission in the current TTI, TTI_(Current). The basestation 415 may then transmit the paging indicator on the PICHimmediately prior to the scheduled future time (TTI_(Current)+Δ). Thetime between PICH and associated TTI may be fixed or variable and may behard-coded or broadcast as part of the system information.

The WTRU-L1 425 monitors the PICH when awake looking for a pagingindicator. When a paging indicator is found, the WTRU-L1 425 monitorsthe HS-SCCH during the time interval, T_(PICH) or Δ, depending on whichof the above embodiments are utilized, looking for a H-RNTI. If thepaging indicator is not found, the WTRU-L1 425 re-enters sleep mode andwaits for the next paging indicator opportunity. If the WTRU-L1 425successfully receives a paging indicator and the common or WTRU-specificpaging H-RNTI, the WTRU-L1 425 retrieves the message from the HS-PDSCHand forwards the message to the higher layer WTRU RRC 430, (step 465).

Alternatively, in Case 2 as shown in FIG. 4, no PICH is used. Uponreceiving a message via the lub interface from the CRNC 410, such as apaging type I message, the base station 415 transmits a message to theWTRU-L1 425 over the HS-SCCH via the Uu interface, (step 470). Either agroup or WTRU-specific H-RNTI may be used. The paging message may betransmitted within a predetermined number of TTIs after the WTRU's 420scheduled DRX wakeup time, or within a time interval window T_(PICH) asdescribed above. When the WTRU 420 determines that a paging indicator ispresent and addressed to the WTRU 420, the appropriate HS-PDSCH ismonitored by the WTRU-L1 425, (step 475), and the message is receivedand forwarded to higher layers, (step 480).

Alternatively, in Case 3 as shown in FIG. 4, a PICH is used but noHS-SCCH is required. Upon receiving a message via the lub interface fromthe CRNC 410 such as a paging type I message, the base station 415transmits a message to the WTRU-L1 425 over the PICH via the Uuinterface, (step 485). After a time interval T_(PICH), which is betweenT_(PICH) _(_) _(HSPDSCH) _(_) _(MIN) and T_(PICH) _(_) _(HSPDSCH) _(_)_(MAX), as described below with reference to Equation 3, the basestation 415 transmits a HS-PDSCH(s), (step 490). When the WTRU 420 isconfigured for operation with common H-RNTI (in other words a dedicatedH-RNTI has not been assigned), the WTRU-L1 425 receives the transmittedHS-PDSCHs transmitted between T_(PICH) _(_) _(HSSCCH) _(_) _(MIN) andT_(PICH) _(_) _(HSSCCH) _(_) _(MAX) after detection of the PICH. NoHS-SCCH is required. If a positive CRC is obtained from one or asoft-combination of any of the HS-PDSCHs, the received message isforwarded to higher layers, (step 495).

In the cases described above, if no message is received over any of thevarious channels within the determined time interval (T_(PICH) or Δ),the WTRU may then re-enter a sleep mode. In the various embodimentsdescribed above, a cell update procedure that is known to those skilledin the art may be performed after the WTRU 420 receives and processesthe paging message, (step 500).

In Case 1 of FIG. 4, a time delay exists between the PICH frame thatincludes the paging indicators and the first received subframe of theassociated HS-SCCH received at the WTRU. The delay T_(PICH) between thePICH and following message transmitted over the HS-SCCH is defined byEquation 2 above and is between T_(PICH) _(_) _(HSSCCH) _(_) _(MIN) andT_(PICH) _(_) _(HSSCCH) _(_) _(MAX). Typically, the base station willstart transmitting the HS-SCCH T_(PICH) _(_) _(HSSCCH) _(_) _(MIN) afterthe PICH is transmitted. However, the base station could wait untilT_(PICH) _(_) _(HSSCCH) _(_) _(MAX) to transmit the HS-SCCH. This timingrelationship is shown in FIG. 5. The first subframe of the associatedHS-SCCH begins after a time delay, T_(PICH), after the transmitted PICHframe.

In case 3 of FIG. 4, a time delay exists between the PICH frame thatincludes the paging indicators and the first received subframe of theassociated HS-PDSCH(s). Similar to Equation 2 above, the delay T_(PICH)between the PICH and following message transmitted over the HS-PDSCH(s)is defined as:

T_(PICH) _(_) _(HSPDSCH) _(_) _(MIN)≦T_(PICH)≦T_(PICH) _(_) _(HSPDSCH)_(_) _(MAX). Equation (3)

Typically, the base station will start transmitting the HS-PDSCHT_(PICH) _(_) _(HSPDSCH) _(_) _(MIN) after the PICH is transmitted.However, the base station could wait until T_(PICH) _(_) _(HSPDSCH) _(_)_(MAX) to transmit the HS-PDSCH. This timing relationship is shown inFIG. 6. The first subframe of the associated HS-PDSCH begins after atime delay, T_(PICH), after the transmitted PICH frame.

In addition to the configurations and methods described above, the rulesfor evaluating the Boolean variable HS_DSCH_RECEPTION may be modified toallow HSDPA reception in the Cell_PCH state and the URA_PCH state. Inparticular, the variable should evaluate to TRUE (i.e. paging via HSDPAis supported) when: a WTRU is in Cell_PCH and URA_PCH state, the DLradio link is configured as the serving HS-DSCH radio link, and there isat least one radio bearer mapped to HS-DSCH.

Referring to FIG. 7, a HSDPA capable wireless communication network 700includes a WTRU 710, a base station 720, an RNC 730, and a core network740. Base station 720 includes a scheduler 750 for scheduling pagingmessages over the PICH, HS-SCCH, and HS-PDSCH as described herein. Thescheduler 750 may also include processing capabilities for processingvarious base station information received from both the RNC 730 and theWTRU 710 via the base station 720 transceiver 760. The WTRU 710 includesa processor 770 and a transceiver 780. The processor 770 is preferablyconfigured to perform various processing tasks required by the WTRU 710,such as those described above with reference to FIG. 3 and FIG. 4. Theprocessor 770 is further preferably configured to control a DRX cycle ofthe WTRU 710 and provide DRX information to the base station 720 asdesired. The transceiver 780 is preferably configured to receive variouschannels transmitted by the base station 720, including the PICH,HS-SCCH, and HS-PDSCH.

Although features and elements are described above in particularcombinations, each feature or element can be used alone without theother features and elements or in various combinations with or withoutother features and elements. The methods or flow charts provided hereinmay be implemented in a computer program, software, or firmwareincorporated in a computer-readable storage medium for execution by ageneral purpose computer or a processor. Examples of computer-readablestorage mediums include a read only memory (ROM), a random access memory(RAM), a register, cache memory, semiconductor memory devices, magneticmedia such as internal hard disks and removable disks, magneto-opticalmedia, and optical media such as CD-ROM disks, and digital versatiledisks (DVDs).

Suitable processors include, by way of example, a general purposeprocessor, a special purpose processor, a conventional processor, adigital signal processor (DSP), a plurality of microprocessors, one ormore microprocessors in association with a DSP core, a controller, amicrocontroller, Application Specific Integrated Circuits (ASICs), FieldProgrammable Gate Arrays (FPGAs) circuits, any other type of integratedcircuit (IC), and/or a state machine.

A processor in association with software may be used to implement aradio frequency transceiver for use in a wireless transmit receive unit(WTRU), user equipment (UE), terminal, base station, radio networkcontroller (RNC), or any host computer. The WTRU may be used inconjunction with modules, implemented in hardware and/or software, suchas a camera, a video camera module, a videophone, a speakerphone, avibration device, a speaker, a microphone, a television transceiver, ahands free headset, a keyboard, a Bluetooth® module, a frequencymodulated (FM) radio unit, a liquid crystal display (LCD) display unit,an organic light-emitting diode (OLED) display unit, a digital musicplayer, a media player, a video game player module, an Internet browser,and/or any wireless local area network (WLAN) or Ultra Wide Band (UWB)module.

What is claimed is:
 1. A method implemented by a network entity tofacilitate paging of a wireless transmit/receive unit (WTRU) for highspeed downlink packet access (HSDPA) wireless communications, the methodcomprising: sending, via a broadcast, system information indicating adelay between reception of a paging indicator and reception of amessage; sending, from the network entity, HSDPA associated pagingindicator channel (PICH) information elements comprising PICHinformation; sending, during one or more paging occasions of the WTRU, apaging indicator over a PICH; and sending a message on a high speedphysical downlink shared channel (HS-PDSCH), wherein a maximum delaybetween the reception of the paging indicator and the reception of themessage is pre-determined.
 2. A network entity configured for high speeddownlink packet access (HSDPA) wireless communications with a wirelesstransmit/receive unit (WTRU), comprising a transmit/receive unit and aprocessor configured to: send, via a broadcast, system informationindicating a delay between reception of a paging indicator and receptionof a message; send HSDPA associated paging indicator channel (PICH)information elements comprising PICH information; send, during one ormore paging occasions, the paging indicator over a PICH using theselected PICH information; and send the message on a high speed physicaldownlink shared channel (HS-PDSCH), wherein a maximum delay between thereceptions of the paging indicator and the message is pre-determined. 3.The network entity of claim 2, wherein the network entity is configuredto: send a common high speed downlink shared channel (HS-DSCH) radionetwork transaction identity (H-RNTI).
 4. A method implemented by anetwork entity to facilitate paging of a wireless transmit/receive unit(WTRU) for high speed downlink packet access (HSDPA) wirelesscommunications, the method comprising: sending, via a broadcast, systeminformation indicating a delay between reception of a paging indicatorand reception using a high speed shared channel; sending, from a basestation, HSDPA associated paging indicator channel (PICH) informationelements comprising PICH information; sending, during paging occasions,the paging indicator over a PICH; sending a high speed downlink sharedchannel (HS-DSCH) radio network transaction identity (H-RNTI); andsending the high speed shared channel, wherein a maximum delay betweenthe reception of the paging indicator and the reception using the highspeed shared channel is pre-determined.
 5. A network entity configuredfor high speed downlink packet access (HSDPA) wireless communicationswith wireless transmit/receive unit (WTRU), comprising: atransmit/receive unit and a processor configured to: send, via abroadcast, system information indicating a delay between reception of apaging indicator and reception using a high speed shared channel; sendHSDPA associated paging indicator channel (PICH) information elementscomprising PICH information; send, during paging occasions, the pagingindicator over a PICH; send a high speed downlink shared channel(HS-DSCH) radio network transaction identity (H-RNTI); and send a highspeed shared channel, wherein a maximum delay between the reception ofthe paging indicator and the reception using the high speed sharedchannel is pre-determined.